Replacing some assertions for W_BuiltinType with W_TypeObject
Replacing some assertions for W_BuiltinType with W_TypeObject

Since every W_TypeObject now has a rw_strategy this is possible wherever the
assertions were made to look up this attribute.

babelsberg/babelsberg-r,babelsberg/babelsberg-r,babelsberg/babelsberg-r,topazproject/topaz,topazproject/topaz,topazproject/topaz,babelsberg/babelsberg-r,topazproject/topaz,babelsberg/babelsberg-r